Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fcf65d592c4282…

MALICIOUS

PDF

70.1 KB Created: 2021-04-06 00:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6a9b6c7c109c679e827fab3b4329813 SHA-1: 77c3199a063255a907f8a72bfeb163d3de9e4775 SHA-256: a0fcf65d592c42822f494a71a5b6e18ac58ec64a084e9bb587ae9ce154ca5865
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, a common tactic for link farms and phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mezovuduw.ru/wix?keyword=redcat+rampage+xt+parts+manual
    • http://jedetifujupeg.iblogger.org/moxafoxotanefu.pdf
    • https://cdn-cms.f-static.net/uploads/4473049/normal_6056a4165ef35.pdf
    • https://cdn-cms.f-static.net/uploads/4383929/normal_60170d71237b7.pdf
    • https://cdn-cms.f-static.net/uploads/4470027/normal_6055ae171bd3e.pdf
    • https://static.s123-cdn-static.com/uploads/4383798/normal_5ff9d85cbbc65.pdf
    • https://cdn-cms.f-static.net/uploads/4413223/normal_6018a145210d5.pdf
    • https://cdn.sqhk.co/kosozezoxuxe/hiXjctU/offline_wallpaper_download.pdf
    • https://static.s123-cdn-static.com/uploads/4477183/normal_5fe0b3e1e3a98.pdf
    • https://cdn.sqhk.co/voxedifi/Lx2hhcl/zedugafojufotusonezaraver.pdf
    • https://cdn.sqhk.co/goberirud/3StKK3e/43570625797.pdf
    • https://cdn.sqhk.co/joxomawezu/qheZjhP/27746710015.pdf
    • http://lajalura.22web.org/selected_astm_standards_for_structural_steel_fabrication.pdf
    • https://cdn-cms.f-static.net/uploads/4413850/normal_5fd7c782e8d8b.pdf
    • https://cdn.sqhk.co/letarezetap/Cm9jfWu/13324013923.pdf
    • https://cdn.sqhk.co/guwuweri/0hha8dO/starz_customer_service_phone.pdf
    • https://cdn.sqhk.co/fegadosijete/hu8hiiT/15912430918.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://depupumuda.rf.gd/38325917923.pdf
    • http://jerovewoxisabu.epizy.com/antutu_3dbench_apk_latest.pdf
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_f1a4cae278424f88a24b015670fb58b8.pdf?index=true
    • https://3778afa4-e5d9-4bb6-be54-d343c89b577b.filesusr.com/ugd/11c894_d31647d66cee41de98e6cc5fb49ae722.pdf?index=true
    • http://jiwepatifon.rf.gd/8115954064.pdf
    • https://a2214900-82f6-4ed5-a432-d5ffd14110fa.filesusr.com/ugd/306b6b_f358bfad63ce40aa8bf2c8d7de6bff5f.pdf?index=true
    • https://aa6d2f86-95e2-42cc-897e-6bbd71c3a116.filesusr.com/ugd/78daac_6b53811ce4be41b48cdb4941834a35c0.pdf?index=true
    • https://53f03ce6-db0b-4f41-9bfc-6956ba41e1f4.filesusr.com/ugd/727e0f_4c89de29c52d44f9b598918a97fa4049.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4d5.bin
0fb3a427fb05da503326c6b8a65c0197f8363447694c0bd34abb8640de38e7b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D5 5468 bytes
font_01_sfnt_off0000e761.bin
4af27dc104255d96bd90f0471833f99c68934a6966b845a10cfa97a2e83b3aa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE761 10408 bytes

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